2D Drawing in OpenGL

I want to draw something that isn't 3D at all. I guess I'd like to draw something without any projection, kind of like "in the front" of the screen. So when I draw something with the coordinates -.5,.5 as left corner and 0,0 and the bottom right corner, I'd like it to cover exactly 1/4th the screen, the second quadrant. I also need to do this after I draw some projected stuff.

I'm guessing it would have to do something with setting up another camera orthographically, then pushing the matrix calling the camera render function, and drawing?